I have Dell U2415 connect to my laptop. On laptop I can manage brightnes with fn + arrow, but this work only on laptop. It show windows show
But dell not react is there some application can do this? Drivers not help.
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You need to install the Dell Display Manager.
Dell Display Manager is a Microsoft Windows application used to manage a monitor or a group of monitors. It allows manual adjustment of the displayed image, assignment of automatic settings, energy management, window organization, image rotation, and other features on select Dell monitors. Once installed, Dell Display Manager runs each time the system starts and places its icon in the notification tray. Information about monitors connected to the system is available when hovering over the notification-tray icon.
Using the Quick Settings Dialog
Clicking Dell Display Manager's notification tray icon opens the Quick Settings dialog box. When more than one supported Dell monitors are connected to the computer, a specific target monitor can be selected using the menu. The Quick Settings dialog box allows you to easily adjust the brightness, contrast, resolution, window layout, and so on. It also allows you to enable automatic switching between preset modes or to select a preset mode manually.